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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4740f5a40b6a19dd6ac70af0b97f493c48c1c15299648c5d449a04f7bdda6ab6' 
  AND token = '3qJ8cYDZlMyuqwdoBvrJZR4QhfmcWuyknr2Gj4xn9tk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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