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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d2f88c145abcdd11cccf4d5014dada3465ec6d581d481891979b0f75389e19d' 
  AND token = '9wSew4yKJRYfIoFgO2LCyjUI45TuTqvI8eZZpXGB6UE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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