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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7606999e2ab0b3478726cf246a4ecfe55b6db2959115245079a7dfe11d6fcfed' 
  AND token = 'lGbc4T3zD6x4NJxFiEUk3wp4zeg3URPeLiJlbKmKJuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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