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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9235ae05a26befe8c67ec5fa1d894b4a0a213a8b63363706abfa5faecc1afd09' 
  AND token = 'Xhdjtb2EXaOdOh7Mu9LGzlyDnG4VF+bk3ZnQhJa+jYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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