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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '494af52f6662dee0c60342f7431e77eccf3b489343936489a2a930c6f2798c1a' 
  AND token = 'pLNDi9nxegaoJzE8Jsi9bRmEju1KdrN7ogDUesm2nGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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