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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9d6042d7557dfe083619e11b0b79b53e5c35abdee3b5240541a0651fa727e02' 
  AND token = 'auLdwzC8VawNGuNN/SrlCU58NGg55nQh3qVXkLCf2v0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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