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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '645311dee322f63828d723f8b00cb758d053435315065cf79b453c79aac26c0b' 
  AND token = 'YHHY65nEi69CWYXa8lATMG7ClAu7zZl2d/xlQLXIC4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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