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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bd571e34033b2c8452a0cc442a295039436333cc0f02e1efd8527b9e449eb9f' 
  AND token = '6eabjXqIlZnXKi4gErA0BvmQsewSwDiN1ZyxuvX4/Fo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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