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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cc9d3a2a6b0167153bbfa47ae437ba30ef301d43e418edfc519205b1e94ff4a' 
  AND token = 'pb67a4ju8ygD6eO2IRz8wOnzkZs1dthv9ueEQT0Eqns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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