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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdfe938ee19267d1793e06d163b3ba1e6539d91bcd8ce757b2ad60302900931d' 
  AND token = 'hNdSNv8a6ppn2oVfUPu7nIAg58VI4bFbLFZm0BKURh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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