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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15cb8497f4bd02eebc01c5c785c768db5d6fc1b7e7be44634829e50e1fd1a5e9' 
  AND token = 'AcMRvGZLegKc2P4pU5LuA86IkdZmEKrBzMZ5s3U7S6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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