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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf7e6f3a3366e8c3879ab81261053adc94d89f98376f45508131e3c759c1127f' 
  AND token = 'xErAEfHhvFMU9C3m77O2di67DqNp3TFZBUL+KhUKHrQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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