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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd191ca10e9391090292a3dbc70ea1e07fdc785f5a4a27d8cd1e2af4a240a3a60' 
  AND token = '0ZOPGC89ry56//XlFaCwi29HjzAbVCVlN3soopcmXtw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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