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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3f4485df4e9318673da10224906a86cedf8a4a958bb0efbc81a35fc1049c183' 
  AND token = '8rVhpDBnv2BaB/TB3Vt5Ds72IpwzTcg0/neVM62PU4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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