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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2661c0781436e304703578552b09baaf979aa8d03c68c61cb5c72d4ef4d6c3a' 
  AND token = 'da0Ygl4epZB9phVi4g6bkCONkqhUII8O6wvZVyX8PNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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