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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffc52af44f7ccfd0f4bdd8c41e693e1b841e1e05c2ea2d1882ee5fdf35b5a781' 
  AND token = 'cw7WyIojHCQpCJFNAcYWtr/w68CoLr0raCtmgQA7/+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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