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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '620e17892ac0ced2c7b1e4bcadfff0da6c6c88769028aa1398b451760ae36ec2' 
  AND token = '9l8sacV2dE+v5maVr4Eib+mkljHaVRHgXSr0qoTFLGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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