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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84e6a4234a546245a7f85eff5ba43dde336be39a6886d5a4c23501fd2d7d3779' 
  AND token = 'Ge98dAajBsTYKGJgGi06fF9iMhFGTSO3rmytSAQwp8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}