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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8f9ac2a77a17b9bee82a5f288d2ec64518d8ad0c2732c12122886d4020d9422' 
  AND token = 'JNCF2qK6WJa7DtczBjeICBm40/nJfgs/TpJgMK75PmY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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