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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a959c9e5ce081361924b4ea180dbcaa5bcfc19c3c23d1c967719d1e1cfbeb68' 
  AND token = '8Ii8RFK53CO/HrWXxCckRFYUIyyICp9HUSHKX+HJV+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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