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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbab94d4ddb18c54308e8c2337934802514332973c5a1a7a99edaf48805efa13' 
  AND token = 'Mlti8Z6fii667s29pmyI9SSqrOqF3Z8a3+Q7Mo1ckUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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