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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8697dd3f90295f213d413a04b654de9eb290bc942bb6b00b03ca99eeb6e070c2' 
  AND token = '2R3mHs3reFFJ50asY+HuLGqO4ZXILKk+hhjU9m+6JNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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