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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e976cf98e3c72238d7a7eebdb14e76b139f2c00b084415fe9a69280d4754f2f0' 
  AND token = 'PzeErOvCLRSxwG76Wl5ybhchdHbe9pI7C6R8ar5kho8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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