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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9638cacde15d82128f193a14c187b8968dc6f8adb4ceb6e2a1a28a5fd3aebd14' 
  AND token = 'GS7WGU9aYE9otnsIPJiQnWv0KXps3uqywywC1ggDdd8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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