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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7c3ddd7ad79357f8a7b0baced8aea4b929f98ea746aebeda20f279eac1ee9c3' 
  AND token = 'ya41vnuX0Zc3KMwrKnZXaau14V4/3tgEIs3V6YluABU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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