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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2f69d6904dd5e05307d8809b19c25b82901fa49b306c792255cd146213c2dfd' 
  AND token = 'Q6C3mlY4HW1yGRNlQRfZqr/1Yh1sknROPzmZEbZqBAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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