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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0088ef9b878651710ae3bf449bd01d6dd0f8e8b9f47fe51c594b0f7b4454e1b' 
  AND token = '98LyUroHxn6gMRAourqmeUG3AgVWUY4SQYHSuWX2Hos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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