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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41001c9a2ab76d414cb8cef0dc429bec17538db45794f37c88f3d667252f6ceb' 
  AND token = 'GkYs5JNvSfSVJce2rSQCOV4+B5teVkQL3aObf1OvDRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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