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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fce8d815899645966826f12b77694af8a6461b958ef6f2d5fe1ad18b766b5531' 
  AND token = 'Vqh1dqAe/LECGDah/PGb0nnrASX5TzVJaUXVwlarsBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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