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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcebaf8f197c7ba04b5a704de665379edc778d280a7fee7ecbb91fe2aad60c0a' 
  AND token = '/n7BP6KFHjvbL1HSg3in3WDjTxm++2BkLxrl6lIm51c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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