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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15bb85e878265d4375ff27a30970e94ce76713a08291f3b729cd4f3ecf40228e' 
  AND token = 'JbtN8U/SAphQ2y5jKogWwjuNY6Xc9a6oBtNYqLtb3o4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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