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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9938027b1413b5b810775ade5e963e7fa2f46babf6d3e69908e14b5a3f8d55e8' 
  AND token = 'cZC/QOOlE6polEODpiy+Gud+coK4WuDKTI7nXnLnL2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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