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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fc20b5224cdfd27f53093795d1338af2dd47342bf6f37bdcee44c2c2256ae88' 
  AND token = '4b2iLOSCRVn91TIgq7LTdVmLt/QetDPOb14VOG8/wJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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