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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c0f3d6b5a46f6ee6dd5b362d2e3b423fa8b2a3debbb5637cf0e0d1ebbaad6b5' 
  AND token = 'cb2eYXpNLaXEKxY21FstzlVZL1hqqp47oWhFC+vlbBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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