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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60b207425d6889dbd29c7056132ad6f3c12bebea5c78a8302e0593ed785b7111' 
  AND token = '3aEy+X4yTdZe9itq4kElh+HyVj8nc42bu9yEGxQRpSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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