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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b207910ac50df26c31f2d3b250098f1916df570db1f48410fbe353441d3f6d8' 
  AND token = 'rnecTplksE3bt1HGYPIWslx5q7m3gEqCQI0VztR9GNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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