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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4dacd26d9c045327d7efef76834f2c3b5d9cba3f4fdb29768b973cbe1679ea06' 
  AND token = '7EkrXBzfAfjTSrrY65nCxbNuvAZ9Fcl7+DxyOIcXvcA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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