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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8490824bf00965cd89e3feb24315a77eaae082b1b741001659d32e4586d936f' 
  AND token = 'TV/F6hMyrLczi0SxqyRP/AM8UjHSQH5b7oKXVZQHtF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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