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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f558294a4cb4b9ca0875ba3d9d5cdf5aa2fa69c4234eded48f38ab502f20ab5e' 
  AND token = 'i0n7isvst+gishmU0g86DtXC/bob42oBJDYLx7HeiRY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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