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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb2cb53daf9b23cd278e71d5a1b15854da7e7bfae5cfaca188964992b8022ec7' 
  AND token = 'vK1sLvUAgfgwgsGCqIRASu7j5EC2Z6mEo+M1c3TVnq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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