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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fab1a792854ae3b8dd6b699edc8764faaac854b75b4e0d51b3690d04f8790b63' 
  AND token = 'N/+7aw/F5hfUd78z962HyTYDPazJv072IN1pTB/pe6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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