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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b55716a5a1e2907a87bae6760dbc42e904f1333da21b8bc4e941fac8a1e545cd' 
  AND token = '4VWEcWBDiGHMIfkBzAODo9+mBUIjtr+Ruma73wAz/z4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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