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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '508032e8a055ca3b59e0474d4735ca3ce12dc327197cb8534878fb1e5ea4f042' 
  AND token = '3eEW328+sMQJOrMcspkKo69u8guGQ/iFsgNnsSsHm1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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