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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbceccdb5fb1bc50d94eba1def859f9ef88152fb7ada9b79ad1d350e63420990' 
  AND token = 'KWucVukHeKWOKox9TAdJ/f2vOhcGOotZYGpEijJsrTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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