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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '908367546477c50e43444285821d1e9c0e15e2dc61730acc26a128e953f649e7' 
  AND token = 'yM17gfOzQgWsQqkQR9IuScIRuj4XtcFvoy8E73PBPrM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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