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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bd04186014ea465079c52421751ba669ab7e64da178502975ff5b1e794da01c' 
  AND token = 'PhgxPLBk5pr+QR0/pSsacUs3xQEnighSyzf9Cqb7CZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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