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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bed69a138c06b74f24fc3d7cb01c438a8ecfd9d985d9abc57940b11d66718a43' 
  AND token = 'g5P46HAGHG3+1+Is4OxCfsqumb+Yy5ef9VxBxUs6KGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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