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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '969eb9c5f6533ea8ff36db3c3fcd97b6f48e998a2bf4676f9066f6bb21d51cc3' 
  AND token = 'tMliB63+ZAgm5t3kBFw4QldgoG0NGa5j78F6gFctAHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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