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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '376ed902e711c469617f38561bc2aee00ae5626b974b41842b5b9fd6cc0bab1a' 
  AND token = '1BmeEylTBqUz7iQqcY0EHyMEUpANcZx9baq52prOlh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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