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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9d9250f2c3019a8df6363db18cab6af553acc6298c4bfa6d376716335ce1e8b' 
  AND token = 'qx6q33eDK2QUV1w4osTEqIjuHjpCTo91ji2O91+rZlI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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