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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b961d5cd33f12985d28bf0cda15a12545a3ee9ca5e94691417362a2e643451d' 
  AND token = 'ZxcbF3X4JQ9HXEWc0FjMxRtqNBPwv7xHcabyy5FoEMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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