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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6b18afcbd718e17ba1ab2f6a0dbdeae0943994862dfe55c4430da4acd70311f' 
  AND token = 'J2UYyrSbRVXEvlvNunuSUQsZn2CH/FniBbxxctH4IYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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