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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2740a1d4562af87a575e425eb53124d055305510755de1716f4bc3ba35583eec' 
  AND token = '6RXr+bPuOuNDLZL4GkeUiQu4yYF+JXOp2ZrtO4/swJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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