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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc7010c9361df3b2f07af65a8284a597d2052be8d58073ae4f45cd959414407a' 
  AND token = 'lQ1SlYxzAc8PdJ1DleWyfMb7ffyTK8iEvLcr1tvJnwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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