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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bee2946c48fe1365da7c9766ef89850bac14124f52e87402c2453a7dfa027b9c' 
  AND token = 'KW7EO0ZXJaYi17ob7Bymd4ClIW5frRvvDvv0jGwKDxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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