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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63f0ce28c89c14a86aa9ab034fee893dd797810b3cc75b8da72ef08abaca13ce' 
  AND token = 'gno9dn9U1SaTOi+6fUk0zPcro9ce55z/Qgn8n/yhoQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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