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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '138a40e304ff119c1469195748d12e0327d1d3bae1b1790edef2eabd6f79f720' 
  AND token = 'zr9JrJLzlibZJv+K+eT/df/lSj8LJizW33s6ZqbwdvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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