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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f13bb7266bff757b15ef7f82a0da61c617d365c4c47e6711d31cb04688da4fc8' 
  AND token = 's9amDRjJJQRXsYnH6BId2BaTMadX/D8rwP/ICtXWiMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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