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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c56ae4e3f0b65cece71a2173adc93b76c42e1f49ea83b2f4fb2ce6e57f04d18' 
  AND token = 'xWqoe98qKsxzip8MxbmwCr1llQq0LpYoqcuQiK9MfRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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