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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c645f4656b0983732519d2c523c544cefeeb21a2f4202a4adc0637a2b7f750a3' 
  AND token = 'zSJGotJtrNN7coh0om7pS4w63Htc2cgi0eh+JUF1HAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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