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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf9ac36c46a1de0ee45748738ac4fd16e0ac44deb1c3725b51fae7c14586ceca' 
  AND token = 'AO8w+no2WecoSrzrF2Qj+iddmrCTJxJ7wzL+VV+cHKg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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